1098256878 has 12 divisors (see below), whose sum is σ = 2379556608. Its totient is φ = 366085620.

The previous prime is 1098256837. The next prime is 1098256879. The reversal of 1098256878 is 8786528901.

1098256878 is a `hidden beast` number, since 1 + 0 + 9 + 8 + 2 + 568 + 78 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098256879) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30507118 + ... + 30507153.

It is an arithmetic number, because the mean of its divisors is an integer number (198296384).

Almost surely, 2^1098256878 is an apocalyptic number.

1098256878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1098256878 is an abundant number, since it is smaller than the sum of its proper divisors (1281299730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1098256878 is a wasteful number, since it uses less digits than its factorization.

1098256878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61014279 (or 61014276 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The square root of 1098256878 is about 33139.9589317790. The cubic root of 1098256878 is about 1031.7345574295.

The spelling of 1098256878 in words is "one billion, ninety-eight million, two hundred fifty-six thousand, eight hundred seventy-eight".